Laser projection apparatus

Abstract

A laser projection apparatus includes a laser source, a light modulation assembly, and a projection lens. The laser source includes a laser device, a combining lens group, and a polarization conversion component. The combining lens group is located on a laser-exit side of the laser device and configured to combine laser beams of different colors emitted by a light-emitting group to a same position and propagate the combined laser beam in a preset direction. The polarization conversion component is configured to change a polarization direction of a portion of the laser beam of at least one color. The light modulation assembly includes a fly-eye lens group. The fly-eye lens group is located on a laser-exit side of the laser source and configured to homogenize the incident laser beam.

What is claimed is: 
     
         1 . A laser projection apparatus, comprising:
 a laser source configured to provide illumination beams, and the laser source including:
 a laser device including:
 a plurality of first light-emitting components configured to emit a first laser beam; 
 a plurality of second light-emitting components configured to emit a second laser beam; and 
 a plurality of third light-emitting components configured to emit a third laser beam; wherein the plurality of first light-emitting components, the plurality of second light-emitting components, and the plurality of third light-emitting components each are arranged in an array, so as to provide a light-emitting group; 
 
 a combining lens group located on a laser-exit side of the laser device and configured to combine the laser beams of different colors emitted by the light-emitting group to a same position and propagate the combined laser beam in a preset direction; and 
 a polarization conversion component located on the laser-exit side of the laser device and configured to change a polarization direction of a portion of the laser beam of at least one color, so that the laser beam of the at least one color has different polarization directions; 
   a light modulation assembly configured to modulate the illumination beams with image signals, so as to obtain projection beams; and the light modulation assembly including:
 a fly-eye lens group located on a laser-exit side of the laser source and configured to homogenize the incident laser beam; and 
 a light modulation device configured to modulate the illumination beams to obtain the projection beams; and 
   a projection lens configured to project the projection beams into an image.   
     
     
         2 . The laser projection apparatus according to  claim 1 , wherein wavelengths of the first laser beam, the second laser beam, and the third laser beam are different from each other, and the light-emitting group includes a first light-emitting group, a second light-emitting group, and a third light-emitting group;
 the plurality of first light-emitting components are arranged in an array, so as to provide the first light-emitting group, and the first light-emitting group is configured to emit the first laser beam;   the plurality of second light-emitting components are arranged in an array, so as to provide the second light-emitting group, and the second light-emitting group is configured to emit the second laser beam; and   the plurality of third light-emitting components are arranged in an array, so as to provide the third light-emitting group, and the third light-emitting group is configured to emit the third laser beam;   wherein a size of a beam spot combined by the combining lens group matches Etendue of the fly-eye lens group.   
     
     
         3 . The laser projection apparatus according to  claim 2 , wherein the combining lens group includes:
 a first combining lens group configured to combine the first laser beam emitted by the first light-emitting group with the laser beam emitted by one of the second light-emitting group and the third light-emitting group; and   a second combining lens group configured to combine the laser beam combined by the first combining lens group with the laser beam emitted by another of the second light-emitting group and the third light-emitting group.   
     
     
         4 . The laser projection apparatus according to  claim 3 , wherein
 the first light-emitting group includes a first light-emitting sub-group and a second light-emitting sub-group; and   the first light-emitting sub-group and the second light-emitting sub-group are arranged in a row along a first direction, and the second light-emitting group and third light-emitting group are arranged in another row along the first direction.   
     
     
         5 . The laser projection apparatus according to  claim 4 , wherein the first light-emitting sub-group and the second light-emitting group are arranged in at least one column along a second direction, and the second light-emitting sub-group and the third light-emitting group are arranged in at least one column along the second direction; the first direction is perpendicular to the second direction; and
 a number of rows in an array provided by the first light-emitting group is equal to a number of rows in an array provided by the second light-emitting group and the third light-emitting group, and a number of columns in the array provided by the first light-emitting group is equal to a number of columns in the array provided by the second light-emitting group and the third light-emitting group.   
     
     
         6 . The laser projection apparatus according to  claim 4 , wherein
 the first combining lens group includes:
 a first reflector located on a laser-exit side of the first light-emitting group and configured to reflect the first laser beam; and 
 a first combining lens located on laser-exit sides of the third light-emitting group and the first reflector and configured to reflect the third laser beam and transmit the first laser beam; 
   the second combining lens group includes:
 a second reflector located on a laser-exit side of the second light-emitting group and configured to reflect the second laser beam; 
 a third reflector located on a laser-exit side of the second reflector and configured to reflect the second laser beam; and 
 a second combining lens located on laser-exit sides of the first combining lens and the third reflector and configured to transmit the second laser beam and reflect the first laser beam and the third laser beam. 
   
     
     
         7 . The laser projection apparatus according to  claim 4 , wherein
 the first combining lens group includes:
 a first reflector located on a laser-exit side of the first light-emitting group and configured to reflect the first laser beam; and 
 a first combining lens located on laser-exit sides of the second light-emitting group and the first reflector and configured to reflect the second laser beam and transmit the first laser beam; 
   the second combining lens group includes:
 a second reflector located on a laser-exit side of the third light-emitting group and configured to reflect the third laser beam; 
 a third reflector located on a laser-exit side of the first combining lens and configured to reflect the first laser beam and the second laser beam; and 
 a second combining lens located on laser-exit sides of the second reflector and the third reflector and configured to transmit the first laser beam and the second laser beam, and reflect the third laser beam. 
   
     
     
         8 . The laser projection apparatus according to  claim 4 , wherein
 the first light-emitting components are configured to emit one of a green laser beam, a blue laser beam, and a red laser beam;   the second light-emitting components are configured to emit another of the green laser beam, the blue laser beam, and the red laser beam; and   the third light-emitting component are configured to emit yet another of the green laser beam, the blue laser beam, and the red laser beam.   
     
     
         9 . The laser projection apparatus according to  claim 4 , wherein
 the first light-emitting components are configured to emit a red laser beam;   the second light-emitting components are configured to emit one of a green laser beam and a blue laser beam; and   the third light-emitting components are configured to emit another of the green laser beam and the blue laser beam.   
     
     
         10 . The laser projection apparatus according to  claim 2 , wherein the first light-emitting group includes a first light-emitting sub-group and a second light-emitting sub-group, and the combining lens group includes:
 a first combining lens group configured to combine the first laser beams emitted by the first light-emitting sub-group and the second light-emitting sub-group;   a second combining lens group configured to combine the laser beams emitted by the second light-emitting group and the third light-emitting group; and   a third combining lens group configured to combine the laser beam combined by the first combining lens group with the laser beam combined by the second combining lens group.   
     
     
         11 . The laser projection apparatus according to  claim 10 , wherein
 the second light-emitting group and the first light-emitting sub-group are arranged in a row along a first direction, the third light-emitting group and the second light-emitting sub-group are arranged in another row along the first direction, the first light-emitting sub-group and the second light-emitting sub-group are arranged in at least one column along a second direction, the second light-emitting group and the third light-emitting group are arranged in at least one column along the second direction, and the first direction is perpendicular to the second direction.   
     
     
         12 . The laser projection apparatus according to  claim 11 , wherein
 a number of rows in an array provided by the first light-emitting sub-group and the second light-emitting group is equal to a number of rows in an array provided by the second light-emitting sub-group and the third light-emitting group, and a number of columns in the array provided by the first light-emitting sub-group and the second light-emitting group is equal to a number of columns in the array provided by the second light-emitting sub-group and the third light-emitting group.   
     
     
         13 . The laser projection apparatus according to  claim 11 , wherein
 the first laser beams emitted by the first light-emitting sub-group and the second light-emitting sub-group are a first linearly polarized light, the second laser beam emitted by the second light-emitting group and the third laser beam emitted by the third light-emitting group are a second linearly polarized light, and polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other; and   the polarization conversion component is further configured to adjust the polarization direction of the incident laser beam, so that the first linearly polarized light is converted into the second linearly polarized light, and the second linearly polarized light is converted into the first linearly polarized light.   
     
     
         14 . The laser projection apparatus according to  claim 13 , wherein the polarization conversion component includes:
 a first polarization conversion component located on laser-exit sides of the first light-emitting sub-group and the second light-emitting group, the first polarization conversion component being configured to adjust the polarization direction of the incident laser beam, so that the first linearly polarized light is converted into the second linearly polarized light, and the second linearly polarized light is converted into the first linearly polarized light; and   a second polarization conversion component located on a laser-exit side of the third light-emitting group, and the second polarization conversion component being configured to adjust the polarization direction of the incident laser beam, so that the second linearly polarized light is converted into the first linearly polarized light.   
     
     
         15 . The laser projection apparatus according to  claim 13 , wherein the polarization conversion component includes:
 a third polarization conversion component located on a laser-exit side of the first light-emitting sub-group and configured to adjust the polarization direction of the incident laser beam, so that the first linearly polarized light is converted into the second linearly polarized light.   
     
     
         16 . The laser projection apparatus according to  claim 13 , wherein
 the first combining lens group includes:
 a first portion of a first reflector located on a laser-exit side of the first light-emitting sub-group and configured to reflect the first laser beam; and 
 a polarization combining lens located on laser-exit sides of the second light-emitting sub-group and the first portion of the first reflector, and the polarization combining lens being configured to transmit the second linearly polarized light and reflect the first linearly polarized light; 
   the second combining lens group includes:
 a second portion of the first reflector located on a laser-exit side of the second light-emitting group and configured to reflect the second laser beam; and 
 a first combining lens located on a laser-exit side of the third light-emitting group and the laser-exit side of the second portion of the first reflector, and the first combining lens being configured to reflect the third laser beam and transmit the second laser beam; 
   the third combining lens group includes:
 a second reflector located on a laser-exit side of the first combining lens and configured to reflect the second laser beam and the third laser beam; and 
 a second combining lens located on laser-exit sides of the second reflector and the polarization combining lens, and the second combining lens being configured to transmit the second laser beam and the third laser beam, and reflect the first laser beam. 
   
     
     
         17 . The laser projection apparatus according to  claim 16 , satisfying one of following:
 the first light-emitting components are configured to emit a red laser beam, one of the second light-emitting components and the third light-emitting components is configured to emit a blue laser beam, and another of the second light-emitting components and the third light-emitting components is configured to emit a green laser beam; and   the first light-emitting components are configured to emit the blue laser beam, one of the second light-emitting components and the third light-emitting components is configured to emit the red laser beam, and another of the second light-emitting components and the third light-emitting components is configured to emit the green laser beam.   
     
     
         18 . The laser projection apparatus according to  claim 2 , wherein
 the first light-emitting group includes a first light-emitting sub-group and a second light-emitting sub-group; an arrangement direction of the first light-emitting sub-group and the second light-emitting sub-group is perpendicular to an arrangement direction of the first light-emitting sub-group and the second light-emitting group and an arrangement direction of the second light-emitting sub-group and the third light-emitting group.   
     
     
         19 . The laser projection apparatus according to  claim 1 , wherein the light modulation assembly further includes a first light homogenizing component located on the laser-exit side of the laser source, and the first light homogenizing component is configured to homogenize and diffuse the illumination beams from the laser source. 
     
     
         20 . The laser projection apparatus according to  claim 19 , wherein the light modulation assembly further includes:
 a beam shaping assembly located on a laser-exit side of the first light homogenizing component, the beam shaping assembly being configured to converge the illumination beams diffused by the first light homogenizing component, the fly-eye lens group being located on a laser-exit side of the beam shaping assembly; and   a lens assembly located on a laser-exit side of the fly-eye lens group and configured to propagate the illumination beams to the light modulation device.